I. Introduction
With the rapid development of robot technology in recent years, teleoperated manipulators have gained widespread adoption in industrial manufacturing, medical assistance and hazardous environments [1], [2], [3]. The advantage of a teleoperated robotic arm is that it can replace humans in highrisk [4], high-precision [5], and labor-intensive tasks [6], thereby improving work efficiency and reducing the risk of personal injury. However, to achieve precise control of the robotic arm, it is crucial to accurately obtain and control the angle information of the upper limb joints [7].